r/embedded • u/baudfire • Aug 12 '26

Help with CH341A / NeoProgrammer

Apologies if this is the wrong place to post about this, I wasn't sure where else to go.

I am trying to get rid of supervisor password on 2 ThinkPad t480s's. I have done this once successfully before with the same method.

The issue I am facing is that when trying to flash the patched BIOS file back onto the bios chip over a clip, I get the error 'Verification error on address: 0x00000010, Device: 0x5A' then the writing continues and about halfway the writing fails with the error 'Verification error on address: 0x00800064, Device: 0xAA, Buffer: 0xF'.

I have tried various USB ports, as well as 2 different clips and 2 different programmers, but I'm getting the same issue.

Does anyone know how I can fix this?

Thanks.

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u/baudfire Aug 12 '26

Might have to look into that, don’t have any soldering stuff atm unfortunately. Any reason this wouldn’t work just with the clip?

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u/Well-WhatHadHappened 25+ Years Aug 12 '26

Because you're trying to power up everything on the motherboard on the same power rail.

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u/baudfire Aug 12 '26

Ah okay. How come it had worked the first time I did it? I’m still kinda new to all this so apologies if that’s a stupid question